Readily removable window with weather-stripping

ABSTRACT

A removable window applicable to single or plural hung sash designs and particularly to metallic construction. The window includes a casing having jamb channels in which are positioned balance assemblies to be rigidly positioned therein with respect to translational or longitudinal movement. The sash rides on the surface of the balance assembly through guide members which are deformable and the opposite edges of the sash include lower guides which are positioned in the jamb channels remote from the balance assemblies to be guided therein. The sash cords of the balance assemblies have hooks which ride beneath the lower guide means on the sash which hook is turned with pivoting of the sash on the lower guides to lock the sash cords in position in the jamb channels as the window is removed. The sash are removed by pivoting the window away from the balance assemblies through the deformable guide means at the upper edge and tilting the sash to release the lower guides from the jamb channels. Weatherstripping on the window casing and on the sash seal the edges of the sash and the tops and bottoms of the same to provide an airtight window assembly.

United States Taylor et a1.

[ July 18, 1972 [72] Inventors: Henry A. Taylor, York; Maurice E.

Sterner, Jr., Spring Grove, both of Pa.

[73] Assignee: D. J. Dlnsmore Co., Sioux Falls, S. Dak.

[22] Filed: June 22, 1971 [21] Appl. No.: 155,533

s21 u.s.c1 ..49/446,49/181,49/454 51 Int.Cl ..E05d13/12 5s FieldofSearch..49/446,453,454,455,456,

[56] References Cited UNITED STATES PATENTS Mendelsohn ..49/454 PrimaryExaminer-Reinaldo P. Machado Assistant Examiner-Philip C. Kannan [5 7]ABSTRACT A removable window applicable to single or plural hung sashdesigns and particularly to metallic construction. The window includes acasing having jamb channels in which are positioned balance assembliesto be rigidly positioned therein with respect to translational orlongitudinal movement. The sash rides on the surface of the balanceassembly through guide members which are deformable and the oppositeedges of the sash include lower guides which are positioned in the jambchannels remote from the balance assemblies to be guided therein. Thesash cords of the balance assemblies have hooks which ride beneath thelower guide means on the sash which hook is turned with pivoting of thesash on the lower guides to lock the sash cords in position in the jambchannels as the window is removed. The sash are removed by pivoting thewindow away from the balance assemblies through the deformable guidemeans at the upper edge and tilting the sash to release the lower guidesfrom the jamb channels. Weather-stripping on the window casing and onthe sash seal the edges of the sash and the tops and bottoms of the sameto provide an airtight window assembly.

18 Claims, 9 Drawing Figures PATENTED JUL 1 8 I972 SHEET 1 OF 3 FIG, 1,

PATENTED JUL 1 8 I972 SHEET 2 OF 3 I NVEN TOR. Henry A. 7' ay/or BYMaurice E. Sternegdz W/W jw/%z m u M w w MW 6 Z 2 A x m f) m 0 FIG. 3,

FIG. 5,

PATENIEuJmwmn 3.676956 SHEET 3 OF 3 FIG, 9.

INVENTOR. Henry A Taylor Maurice E. Sterne/ 1 READILY REMOVABLE WINDOWWITI-I WEATHER- STRIPPING This invention relates to removable windows,both pluralhung and single sash types having balance assembliesassociated therewith and more particularly an improved window of thistype in which the sash of the same is readily removable from the windowcasing and the sash and casing include weather-stripping to seal thewindow.

Single and double-hung windows having balance assemblies are well knownand in use. Such windows have been made removable from a window casing.The prior patent of Dawson J. Dinsmore U.S. Pat. No. 3,358,404 datedDec. 19, 1967 shows one version of such a window construction. Thisparticular construction requires that the balance assemblies mount toand move with the windows and require special latches in the jambchannels to be operated to remove the sash therefrom. Generally, windowsof this type require translational movement of the sash within the jambchannels and compressibility of the portion of the jamb channel topermit removal of the sash therefrom. This provides for sloppiness infit between sash and jamb channel and leakage of air around the same.This type f construction does not readily permit the addition ofweather-stripping thereto to seal the window. In addition, thisparticular type of construction is not applicable to metal windows.

The present invention in a removable window is applicable to single anddouble-hung windows and is particularly adapted to the use of metalwindow and sash construction. It provides a simplified and improveddesign of a window which of incorporates a balance assembly and in whichboth sash may be readily removable without translational movement of thesame. Further, it provides an improved structure whereby the sash may bemoved in any position in the window casing and further provides for asubstantially rigid guiding mounting of the sash within the casing. Itfurther provides an improved and simplified weather-stripping of thewindow sash in the window casing from the outside toward the insidesealing both sides of each sash surfaces for all positions of movementto effectively weather-strip the window. It further requires no speciallatches and permits a simplified and easy removal of the window.

Therefore it is the principal object of this invention to provide animproved removable window assembly with balances.

Another object of this invention is to provide an improved constructionof this type particularly adapted for metal windows.

A further object of this invention is to provide a removable windowassembly in which the sash may be moved in any position with respect tothe window casing.

A still further object of this invention is to provide an improvedwindow construction of this type incorporating weather-stripping.

A still further object of this invention is toprovide a readilyremovable window assembly incorporating balances which is simple indesign, low in cost and easy to maintain.

These and other objects of this invention will become apparent from areading of the attached description together with the drawings wherein:

FIG. 1 is a perspective view of a removable double-hung window embodyingour invention,

FIG. 2 is a sectional view of the same taken along the lines 22 in FIG.1 and with one sash removed and a second sash tilted outward forremoval,

FIG. 3 is a sectional view of a portion of the casing of FIG. 2 takenalong the lines 33 therein,

FIG. 4 is a rear view of a balance assembly of the improved removablewindow,

FIG. 5 is an elevation view of a sash with parts broken away to show theguide structures thereon,

FIG. 6 is a sectional view of the window casing and a portion of thesash with parts broken away taken along the lines 6-6 in FIG. 7,

FIG. 7 is a sectional view of a portion of the jamb as shown in FIG. 6taken along the lines 7-7 therein,

FIG. 8 is an end elevation view of a sash showing the guide structures,and

FIG. 9 is an end elevation view of the catch for the balance assemblycord.

Our improved window with balance having a removable sash is shown in thedrawings in connection with a doublehung window. The principles of theinvention are equally applicable to single-hung windows and ispreferably utilized in metal window construction. Thus in FIG. 1, thewindow casing is indicated generally at 10 as incorporating side jambs12 and 14 connected to a head frame 16 and a sill frame 20 to form thegeneral rectangular casing construction. The side jambs, head and sillframes are preferably made of an extruded aluminum and the parts areheld together through suitable screws, such as is indicated at 22,extending through apertures in the head and sill frames and into theside jambs, as will be hereinafter described.

. The side jamb construction will best be seen in the elevation view ofFIG. 2 and the sectional view of FIG. 6. Each jamb member has an outerand inner jamb channel, indicated by the numerals 24 and 25, and as willbe noted from the cross-sectional configuration of FIG. 6 the outer orupper sash is of a shorter width dimension than the inner or lower sashin the double-hung window. The jamb construction or cross section is soformed as to define the respective channels 24, 25 by flanges 26, 27 and28 extending transversely out from an irregular base plate portion 30.Flange 26 has a transversely extending guide portion 31 dependingtherefrom which defines one side of the channel 24 or recess. It furtherextends outwardly to include a channel shaped portion 32 which mountsthe weather-stripping material which will bear against the outer sash.The same construction exists for flange portion 27. Thus, the flangeportions 26, 27 with the guide portions 31 extending transverselytherefrom define the recess which extends the length of the jamb channeland in which is positioned the balance assembly, indicated generally at35. The inner jamb channel is similarly formed between the flangeportions 27, 28 with guide flanges 31 extending transversely therefromto define the opening or the recess forming the inner jamb channel 25with the flange portion 27 having a weather-stripping portion 38extending therefrom to bear against the inner sash. Positioned in theupper portion of each of the jamb channels are balance assemblies 35which are identical in construction and are shown in detail in FIG. 4.It should be noted, however, that any particular balance constructionmay be employed which will fit within the recess and will have an outerprojecting guide surface, such as is indicated at 40, for the purpose ofguiding the sash thereon. The back side of the base plate includesextending rib portions 42 which are split and which receive the screws22 holding the head and sill frame portions to the jamb members formingthe sides of the casing. Each jamb member is identical in constructionand when assembled with the head frame and sill frame define alignedrecesses or channels on the sides of the casing to guide the respectivesash therein. The sill frame is inclined toward the outside of thewindow, as will be seen in FIG. 2.

For the purpose of the present disclosure, the balance assembly which isemployed and positioned in each of the jamb channels on either side ofthe sash is shown from the back in FIG. 4 to disclose one version of thesame. It includes a generaliy U shaped or channel shaped metal structure44 having the curved or guide surface 40 on the outer edge of the sameand with a spring 45 connected at one extremity to a pin 46 positionedthrough the sides and secured thereto. The free end of the spring, asindicated at 47, mounts a pulley member 48 having a plurality of sheathsover which the sash cord 49 extends. At the opposite extent of thebalance assembly is positioned a fixed sheath or pulley 50 which isrigidly mounted in the channel by means of a pin 52 extending betweenthe sides of the same. The operation of the balance assembly isconventional with the sash cord extending over the plurality of sheathsof the pulleys 48 and 50 causing the floating pulley 48 connected to thefree end of the spring 49 to move as the sash cord is drawn out from theconfines of the channel member 44 forming the frame for the balanceassembly. A pin 53 positioned at the upper end of the balance assemblyprovides the means by which it is secured in the jamb channel. Thus, aswill be seen in the sectional view of FIG. 3, a bent flange portion 55in the jamb channel at the upper end of the same bears against the pin53 to secure the same in the recess or jamb channel mounting the same ina particular position near the upper end of the jamb channel. The freeextremity of the sash cord 49 carries a hook member 60 which has agenerally V or triangular shaped notch therein and a transverselyextending flange 62 formed integral therewith with an aperture thereinto which the end of the sash cord is knotted. The opposite end of thehook member has a toothed portion 63, for the purpose of which will belater noted. As will be hereinafter identified, the hook members areadapted to ride below a lower guide on the sash to apply a spring biasto the same in a conventional manner.

The individual sash are also preferably of a metallic construction beingmade of extruded parts and held together in assembled relationship toform the four sides or sides, top and bottom of the individual sash. Theparticular details of this construction form no part of the presentinvention except to include provisions for forming of weather-strippingand guides as will be hereinafter noted. Thus, as will be seen in FIG.1, the upper and outer sash 70 which is smaller in width dimension thanthe lower and inner sash 75 is formed basically of side parts 72 withtop and bottom frame parts 73, 74 respectively which are held togetherthrough any suitable means such as screws, as will be hereinafteridentified. The side parts 72 are generally channel shaped on theirouter edges as will be seen in FIGS. and 6. Each of the sash aregenerally of the same construction. On the inner facing surface of thechanneled edges is a weather-stripping flange portion 80 which projectstranslationally from the channel edges and mounts the weather-strippingmaterial. The latter bears against the transversely extending flangeportions 31 of the jamb channel to seal the window at this surface.Positioned in the channel shaped edges of each of the sash are upper andlower guide members identified at 90 and 100, respectively. In theenlarged and broken away view of FIG. 5, the side shape of the upperguide member 90 is disclosed. The upper guide member 90, one of which ismounted on each side of each sash in the window, is a generallybifurcated member having a V shaped notch 92 therein with an inwardlyprojecting flange 93 at one edge of the same. It includes a flat platelike portion 94 attached to the other end of the bifurcated portion. Theflange 93 fits into a slot in the top of the side 72 of the sash frameand on each side thereof with the upper guide member being securedthereto by a screw indicated at 96 threaded through an aperture 97 inthe upper frame portion of the sash. The flat upper surface projectsbeyond the upper level of the sash and is notched as at 98 to fit intothe ridge surface 40 of the balance assembly 35 and guides the sashthereon. The upper guide member is made of a plastic material and theportion of the same carrying the plate like surface or guide portion 94is bendable or deflectable to permit the window to be rotated away fromor over the projecting surface of the balance assembly upon removal. Thelower guide member 100 is also a plastic part which is generallyrectangular in base surface hav ing a projecting flange 102 at one edgethereof which fits through a slot in the lower frame part 74 of the sashand is secured thereto by a screw 103 threaded through an aperture inthe lower end of frame 72 of the sash. This lower guide portion has afirst generally triangular surface 105 projecting a short distance outfrom the main body portion of the guide and with a smaller triangularshaped surface or projection 106 extending therefrom throughout theremainder of the extent of the transversely extending portion. Thescrews 96 and 103, in addition to holding the guide members 90, 100 inplace also connect the side parts 72 of the sash to the top 73 andbottom 74 parts of the sash to hold the same in assembled relationship.FIG. 8 shows the upper and lower guide members 90,

as mounted in the channel shaped edges of the sash as they appear on oneedge of the same with the same construction being present on theopposite edge surface and for the upper and lower sash.

The frame parts when assembled include the suitable recessed surface 78into which the glass pane 76 is positioned to be held therein throughsuitable rubber or vinyl mounting or glazing 77 or equivalent structure.These upper and lower guide parts are made to be plastic material, suchas teflon, to provide a lubricated surface for ease in movement over themetal surface of the jamb channel and balance assembly. When installed,the lower guide will project into the recesses 24, 25 or the jambchannels to ride therein with the triangular surface forming the guidesurface thereof. The triangular projection 106 of each guide 100projects into the recess and below the hook member 60 of the respectivesash cord such that the generally triangular portion of the hookconforms to the shape of the projection 106. In this position the flangeportion 62 is level and the tooth projecting portion 63 is directed awayfrom the sides of the recess and generally parallel thereto to permitthe hooks to slide in the recess. A spring bias is thus supplied to thelower portion of the sash from the balance assembly in a conventionalmanner with the hook member sliding in the channel with window movement.The upper guides 90 ride on the projecting surfaces 40 of the balanceassemblies 35 which are rigidly positioned in the extruded jamb channelsso that no translational movement occurs therebetween. The flangeportions 80 on each sash carry weather-stripping material to seal thesurface of the sash in the jamb channel or window casing at the innersides of the same with the weather-stripping flanges 32 and 38 in thejamb channel bearing against the outer surfaces of the respectivesashes. Thus, the sash dimensions are such as to be slightly less thanthe distance between the exposed surfaces of the balance assembly sothat the window may be readily removed. All draft or air movement willbe sealed by virtue of the weatherstripping bearing against the sides ofthe sash and the sides of the jamb channel on the opposite surfacesthereof as will be best seen in FIG. 6. This inner surface of the headframe 73 mounts a pair of depending weather-stripping flanges 110 whichare positioned to align with the outerjamb channels or the channel forthe outer sash 70 so that the upper edges ofthe same will slide betweenthe weather-stripping material therein to seal the window at the topthereof. The lower edge of the upper sash or the frame part 74 has a Ushaped or L shaped projection extending across the same as indicated inFIG. 7. The upper surface of the lower sash 75 has a similar L shapedprojection on its outer surface with suitable weather-stripping material122 carried therein and in the closed position of the double-hung sash aweather-stripping layer appears between the sashes at the upper andlower edges respectively to seal the window at this point. Plasticblocks 123 are mounted on the upper sash 70 at the ends of the flange115 to block the air passage around the ends of the interlock or flanges115, 120. Further, the sill frame part 20 has weather-stripping flanges125 aligned with the inner jamb channel for the lower sash 75 such thatthe lower edge of the same will be positioned therebetween. In addition,the lower sash has a transversely projecting flange portion extendingfrom the lower frame part at an elevation slightly above theweather-stripping flanges 125 in the sill mounting part to provide ahandle or grip surface for moving the lower sash in its track.

The hook member 60 has a toothed surface 63 as will be best seen in FIG.9 which when the hook member is rotated with rotation of the sash willbite into the metal surface of the jamb channel or the side surfacethereof to maintain the sash cord and hook member in an extendedposition when a sash is removed. Thus, upon movement of the sash up anddown, the sash cord with a hook extremity of the same will follow thesash due to its positioning under the lower guide members 100 to apply aconventional spring bias to the sash to balance the same in thismovement. Whenever the sash is to be removed from the casing, the upperedge of the same is gripped and the sash is rotated outwardly about anaxis defined by the lower guide members 100. This rotation will causethe hook members to rotate in the jamb channel since they ride againstthe triangular surface 106. With rotation of the sash the hook membersmove to a position wherein the toothed surface will bite into the jambchannel and hold the hook 60 in position. The window is then removed bytilting the sash on'one of its guide members to clear the other lowerguide member 100 from the recess or jamb channel permitting the sash tobe lifted out of the window casing. Both balance assemblies on eitherside of the jamb channel will have the respective hook membersmaintained in the position of sash removal so that the sash can bereinserted and installed in the window casing by reversing theprocedure. The compressible or flexible upper guide member 90 insuresthat the upper end of the sash will be guided on the exposed surface ofthe balance assemblies and the weather-stripping surrounding the sashand carried by the sash and jamb assembles, respectively, seal the sashon the sides thereof. The weather-stripping at the head frame part andon the sill frame part of the window casing similarly seal the upper andlower edges of the respective sashes in the closed position of thewindow.

The improved window assembly provides a simplified structureparticularly adapted for metal window construction by means of which thesash may be mounted and positively guided in a window casing or in thejamb channels and yet may be readily removed therefrom for cleaning andmaintenance purposes. The sash cords of the balance assemblies will beretained in a position where the sash may be reinserted so that thehooks will be underneath the lower guides on the sash to apply a springbias to the same. The improved window construction provides a sealedunit in which the sash will be smoothly and firmly guided within thejamb channels or window casing preventing leakage around the same. Theimproved structure is particularly adapted for metal windows withextruded parts for low cost construction.

In considering this invention it should be remembered that the presentdisclosure is illustrative only and the scope of the invention should bedetermined by the appended claims.

What is claimed is:

l. A removable double-hung window comprising, a window casing having apair of jamb channels along the sides of the same and extending alongthe height of the same, a pair of sash slidably mounted respectively inthe jamb channels, a pair of balance assemblies for each sash positionedin the respective jamb channels on each side of said casing, saidbalance assemblies being rigidly positioned therein and having cordmeans removably coupled to the respective sash, said sash havingdeformable guide means positioned at the upper edge thereof with anotched surface to fit over the exposed surface of the balanceassemblies to guide the sash thereon, and additional guide meansattached to the sash at the other end of the same and positioned in thejamb channels to guide the lower end of the sash in the jamb channel topermit pivoting of the sash in the jamb channels with rotation of thesash away from the balance assemblies and the jamb channels at the upperend of the sash.

2. The removable double-hung window of claim 1 in which the guide meanson each side of the sash and at the upper edge thereof include adeformable cantilever portion having a second notched surface at theextremity of the same remote from said first notched surface permittingthe cantilever portion to move translationally of the sash as the sashis rotated away from the balance assemblies.

3. The removable double-hung window of claim 2 in which the additionalguide means at the lower edge of the sash in cludes post means extendingtranslationally of the sash and into the jamb channels to guide the sashtherein in the areas not occupied by these balances assemblies.

4. The removable double-hung window of claim 1 in which the jambchannels are defined by recesses extending in the window casing in whichthe balance assemblies are positioned for each sash, said recessesextending from the top of the casing and in which the additional guidemeans on the sash project into the recesses and are guided therein.

5. The removable double-hung window of claim 4 and including hook meansattached to the end of the cords of each of the balance assemblies whichhook means bear against the underside of the additional guide means oneach of the sashes and slide in the recesses of the jamb channels toapply a spring bias to the sash.

6. The removable double-hung window of claim 5 in which the hook meansat the end of the sash cord for each of the balance assemblies has atriangular shaped notch therein and in which the additional guide meanson the lower edge of each of the sash are generally triangular in crosssection to ride into the notch in the hook means and guide the hookmeans in the jamb channels and which upon rotation of the sash willdisplace the hook means to wedge the same in the jamb channel retainingthe hook and sash cord in a fixed position with removal of the sash.

7. The removable double-hung window of claim 6 in which the windowcasing and the sash are made of metal and the guide means are made of aplastic material.

8. A removable window comprising, a window casing having a jamb channelalong the sides of the same and extending the height of the same, saidjamb channel being defined by a recess in the window casing, at leastone balance assembly positioned in one of the recesses in the sides ofthe casing, a sash adapted to be mounted in the casing and slide in thejamb channel, guide means positioned on the upper side of the sash andincluding a recessed deformable plate adapted to slide on the exposedsurface of the balance assembly, additional guide means attached at theopposite ends of the sides of the sash and having transversely extendingprojecting surfaces positioned in the recesses defining the jamb channelto guide the sash with the first named guide means in the jamb channel,and means including cord means extending from the balance assembly andbearing against one of the second named guide means to bias said sash,said sash being removable from the window casing by rotating the windowabout the axis of the second named guide means with deformation of therecessed plate of the first named guide means to release the sash fromthe balance assembly and with tilting of the window to allow removal ofthe opposite edge of the sash with the guide means thereon from therecesses of the jamb channel.

9. The removable window of claim 8 in which the guide means on the upperedge of the sash include generally U shaped members of deformablematerial with one edge being attached to the sash and the other edgecarrying the guide plate having the notched recess therein.

10. The removable window of claim 9 in which the additional guide meanspositioned at the lower edges of the sash include a flange portion bymeans of which the guide means are attached to the sash with thetransversely extending projection generally triangular in cross sectionand having a width dimension substantially equal to the width dimensionof the recess forming the jamb channel.

11. The removable window of claim 10 in which the means attaching thesash cord to the sash includes a hook member with a generally triangularshaped notch therein with the sash cord being attached to one side ofthe hook and such that the notch conforms with the triangular crosssection of the additional guide means with the hook member having awidth dimension when tilted greater than the width dimension of therecess forming the jamb channel.

12. The removable window of claim 11 in which the sash has a thicknessdimension greater than the width dimension of the jamb channel and thebalance assembly included therein and in which the casing and sash aremade of a metal material with the first and second named guide meansbeing made of a plastic material.

13. The removable window of claim 8 and including twopart weather-stripmeans, one part of which is included in the casing adjacent the jambchannel and adapted to bear against one surface of the sash on both sideedges of the same and a second part carried by the sash and extendingfrom the opposite surfaces thereof bearing against the window casing onboth edges of the sash.

14. The removable window of claim 13 in which the weather-strip meansare formed by a generally U shaped flange portion attached to the sashand casing respectively and including a weather-stripping materialpositioned in the U shaped flange structure adapted to bear against thesash and casing respectively.

15. The removable double-hung window of claim 1 including weather-stripmeans for each sash in said casing, said weatherstrip means being atwo-part structure, one part of which is attached to the casing adjacentthe jamb channels and extending the length of the same to abut onesurface of the sash and the other part being a flanged surface attachedto the opposite side of the sash and bearing against the casing.

16. The removable double-hung window of claim 15 in which theweather-strip means is formed by a flange structure attachedrespectively to the window casing and to the sash for each of the sashand at each of the sides thereof which flange structure is channelshaped in cross section and mounts a strip of weather proofing materialtherein adapted to bear against the surface of the sash and jambrespectively.

17. The removable double-hung window of claim 1 in which the pair ofsash mounted in the respective jamb channels in the window casing havewidth dimensions such that the upper and outer sash is of a smallerwidth dimension than the inner and lower sash such that the upper andouter sash may be removed from the window casing from the inner surfacethereof without contacting the jamb channel which is associated with theopposite sash.

18. The removable double hung window of claim 15 and including furtherweather-stripping means positioned between each of the sash where theyoverlap to seal therebetween with further Weatherstripping meanspositioned between the window casing and the respective sash in theclosed position at the upper and lower edges of the upper and lower sashrespectively.

* i i t i

1. A removable double-hung window comprising, a window casing having apair of jamb channels along the sides of the same and extending alongthe height of the same, a pair of sash slidably mounted respectively inthe jamb channels, a pair of balance assemblies for each sash positionedin the respective jamb channels on each side of said casing, saidbalance assemblies being rigidly positioned therein and having cordmeans removably coupled to the respective sash, said sash havingdeformable guide means positioned at the upper edge thereof with anotched surface to fit over the exposed surface of the balanceassemblies to guide the sash thereon, and additional guide meansattached to the sash at the other end of the same and positioned in thejamb channels to guide the lower end of the sash in the jamb channel topermit pivoting of the sash in the jamb channels with rotation of thesash away from the balance assemblies and the jamb channels at the upperend of the sash.
 2. The removable double-hung window of claim 1 in whichthe guide means on each side of the sash and at the upper edge thereofinclude a deformable cantilever portion having a second notched surfaceat the extremity of the same remote from said first notched surfacepermitting the cantilever portion to move translationally of the sash asthe sash is rotated away from the balance assemblies.
 3. The removabledouble-hung window of claim 2 in which the additional guide means at thelower edge of the sash includes post means extending translationally ofthe sash and into the jamb channels to guide the sash therein in theareas not occupied by these balances assemblies.
 4. The removabledouble-hung window of claim 1 in which the jamb channels are defined byrecesses extending in the window casing in which the balance assembliesare positioned for each sash, said recesses extending from the top ofthe casing and in which the additional guide means on the sash projectinto the recesses and are guided therein.
 5. The removable double-hungwindow of claim 4 and including hook means attached to the end of thecords of each of the balance assemblies which hook means bear againstthe underside of the additional guide means on each of the sashes andslide in the recesses of the jamb channels to apply a spring bias to thesash.
 6. The removable double-hung window of claim 5 in which the hookmeans at the end of the sash cord for each of the balance assemblies hasa triangular shaped notch therein and in which the additional guidemeans on the lower edge of each of the sash are generally triangular incross section to ride into the notch in the hook means and guide thehook means in the jamb channels and which upon rotation of the sash willdisplace the hook means to wedge the same in the jamb channel retainingthe hook and sash cord in a fixed position with removal of the Sash. 7.The removable double-hung window of claim 6 in which the window casingand the sash are made of metal and the guide means are made of a plasticmaterial.
 8. A removable window comprising, a window casing having ajamb channel along the sides of the same and extending the height of thesame, said jamb channel being defined by a recess in the window casing,at least one balance assembly positioned in one of the recesses in thesides of the casing, a sash adapted to be mounted in the casing andslide in the jamb channel, guide means positioned on the upper side ofthe sash and including a recessed deformable plate adapted to slide onthe exposed surface of the balance assembly, additional guide meansattached at the opposite ends of the sides of the sash and havingtransversely extending projecting surfaces positioned in the recessesdefining the jamb channel to guide the sash with the first named guidemeans in the jamb channel, and means including cord means extending fromthe balance assembly and bearing against one of the second named guidemeans to bias said sash, said sash being removable from the windowcasing by rotating the window about the axis of the second named guidemeans with deformation of the recessed plate of the first named guidemeans to release the sash from the balance assembly and with tilting ofthe window to allow removal of the opposite edge of the sash with theguide means thereon from the recesses of the jamb channel.
 9. Theremovable window of claim 8 in which the guide means on the upper edgeof the sash include generally U shaped members of deformable materialwith one edge being attached to the sash and the other edge carrying theguide plate having the notched recess therein.
 10. The removable windowof claim 9 in which the additional guide means positioned at the loweredges of the sash include a flange portion by means of which the guidemeans are attached to the sash with the transversely extendingprojection generally triangular in cross section and having a widthdimension substantially equal to the width dimension of the recessforming the jamb channel.
 11. The removable window of claim 10 in whichthe means attaching the sash cord to the sash includes a hook memberwith a generally triangular shaped notch therein with the sash cordbeing attached to one side of the hook and such that the notch conformswith the triangular cross section of the additional guide means with thehook member having a width dimension when tilted greater than the widthdimension of the recess forming the jamb channel.
 12. The removablewindow of claim 11 in which the sash has a thickness dimension greaterthan the width dimension of the jamb channel and the balance assemblyincluded therein and in which the casing and sash are made of a metalmaterial with the first and second named guide means being made of aplastic material.
 13. The removable window of claim 8 and includingtwo-part weather-strip means, one part of which is included in thecasing adjacent the jamb channel and adapted to bear against one surfaceof the sash on both side edges of the same and a second part carried bythe sash and extending from the opposite surfaces thereof bearingagainst the window casing on both edges of the sash.
 14. The removablewindow of claim 13 in which the weather-strip means are formed by agenerally U shaped flange portion attached to the sash and casingrespectively and including a weather-stripping material positioned inthe U shaped flange structure adapted to bear against the sash andcasing respectively.
 15. The removable double-hung window of claim 1including weather-strip means for each sash in said casing, saidweather-strip means being a two-part structure, one part of which isattached to the casing adjacent the jamb channels and extending thelength of the same to abut one surface of the sash and the other partbeing a flanged surface attached to the opposite side of the sash andbearing against the casing.
 16. The reMovable double-hung window ofclaim 15 in which the weather-strip means is formed by a flangestructure attached respectively to the window casing and to the sash foreach of the sash and at each of the sides thereof which flange structureis channel shaped in cross section and mounts a strip of weatherproofing material therein adapted to bear against the surface of thesash and jamb respectively.
 17. The removable double-hung window ofclaim 1 in which the pair of sash mounted in the respective jambchannels in the window casing have width dimensions such that the upperand outer sash is of a smaller width dimension than the inner and lowersash such that the upper and outer sash may be removed from the windowcasing from the inner surface thereof without contacting the jambchannel which is associated with the opposite sash.
 18. The removabledouble hung window of claim 15 and including further weather-strippingmeans positioned between each of the sash where they overlap to sealtherebetween with further weather-stripping means positioned between thewindow casing and the respective sash in the closed position at theupper and lower edges of the upper and lower sash respectively.